George already suspects that Gatsby is responsible for Myrtle's death when Tom tells George where to find Gatsby.
At this point, Tom knows that it was not Gatsby who was driving when Myrtle was hit. Daisy was driving the car - Gatsby's car - and it was Daisy that killed Myrtle.
Daisy was driving the car that Myrtle ran in front of because she probably believed that...
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